Carrier 19XR Spécifications télécharger pdf (Page 65)

3. View the STARTUP display screen and verify the chilled

water and condenser water pumps have energized.

4. Verify the oil pump has started and is pressurizing the

lubrication system. After the oil pump has run about

11 seconds, the starter energizes (COMPRESSOR START

CONTACT is closed) and goes through its start-up

sequence.

5. Check the main contactor (1M) for proper operation.

6. The PIC II eventually shows an alarm for motors amps

not sensed. Reset this alarm and continue with the initial

start-up.

For Benshaw Inc. solid-state starters:

1. Close the main motor disconnect (CB1). Voltage will be

applied to the compressor motor but the SCRs will not

fire (compressor motor will not rotate). Enter MENU 4 in

the Benshaw RediStart MICRO™ Menu structure at the

Benshaw display (see Input Service Configurations,

Change The Benshaw RediStart MICRO Software Con-

figuration page 57). Select Dry Run Mode and scroll to

YES.

2. Follow steps 2 through 4 for the electro-mechanical start-

ers. When the Ramp Time is set for less than 10 seconds

COMPRESSOR RUN CONTACT will close.

3. The PIC II eventually shows an alarm for motors amps

not sensed. Reset this alarm and enter MENU 4 in the

Benshaw display. Select Dry Run Mode and scroll to NO.

Continue with the initial start-up.

Check Motor Rotation

1. Engage the oil pump circuit breaker (CB3) located inside

the right hand side of the starter panel.

2. Then engage the control power circuit breaker (CB2) lo-

cated in the same section of the starter cabinet.

3. Finally close the main motor disconnect (CB1) on the

front of the starter panel.

4. The ISM mounted in the electro-mechanical starters

checks for proper phase rotation as soon as power is

applied to the starter and the PIC II controls power up.

Solid-state starters have phase protection and do not per-

mit a start if the phase rotation is not correct.

5. An alarm message will appear on the CVC if the phase

rotation is incorrect. If this occurs reverse any 2 of the 3

incoming power leads to the starter and reapply power.

The motor is now ready for a rotation check.

6. After the default screen status message states ‘Ready to

Start’ press the softkey. The PIC II control per-

forms start-up checks.

7. When the starter is energized and the motor begins to

turn, check for clockwise motor rotation (Fig. 33).

Check Oil Pressure and Compressor Stop

1. When the motor is at full speed, note the differential oil

pressure reading on the CVC default screen. It should be

between 18 and 30 psid (124 to 206 kPad).

2. Press the Stop button and listen for any unusual sounds

from the compressor as it coasts to a stop.

To Prevent Accidental Start-Up —

A chiller STOP

override setting may be entered to prevent accidental start-up

during service or whenever necessary. Access the MAINSTAT

screen and using the or softkeys, high-

light the CHILLER START/STOP parameter. Override the cur-

rent START value by pressing the softkey. Press the

softkey followed by the softkey. The word

SUPVSR! displays on the CVC indicating the override is in

place.

To restart the chiller the STOP override setting must be re-

moved. Access the MAINSTAT screen and using or

softkeys highlight CHILLER START/STOP. The

3 softkeys that appear represent 3 choices:

• — forces the chiller ON

• — forces the chiller OFF

• — puts the chiller under remote or schedule

control.

To return the chiller to normal control, press the

softkey followed by the softkey. For

more information, see Local Start-Up, page 46.

The default CVC screen message line indicates which com-

mand is in effect.

Check Chiller Operating Condition —

Check to

be sure that chiller temperatures, pressures, water flows, and

oil and refrigerant levels indicate the system is functioning

properly.

Instruct the Customer Operator —

Ensure the op-

erator(s) understand all operating and maintenance procedures.

Point out the various chiller parts and explain their function as

part of the complete system.

COOLER-CONDENSER — Float chamber, relief valves, re-

frigerant charging valve, temperature sensor locations, pressure

transducer locations, Schrader fittings, waterboxes and tubes,

and vents and drains.

OPTIONAL PUMPOUT STORAGE TANK AND PUMP-

OUT SYSTEM — Transfer valves and pumpout system,

refrigerant charging and pumpdown procedure, and relief

devices.

Do not check motor rotation during coastdown. Rotation

may have reversed during equalization of vessel pressures.

LOCAL

NEXT PREVIOUS

SELECT

STOP

ENTER

START

STOP

RELEASE

ENTER

Fig. 33 — Correct Motor Rotation

1 2 ... 60 61 62 63 64 65 66 67 68 69 70 ... 135 136

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Carrier 19XR Spécifications Page 65

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